1966 Mustang 289 Exhaust manifold Torque Spec. Please - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 08-14-2010 Thread Starter
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1966 Mustang 289 Exhaust manifold Torque Spec. Please

I'm hearing all kinds of torque specs for '66 289. A thread on this site stated 13-18 ft. lbs! That sounds like intake manifold rather than exhaust. The exhaust manifold bolts are 3/8" Shouldn't they be around 35 ft. lbs?

Also, should I use gaskets? This same site mentioned if you use gaskets you can crack the exhaust manifold. Is this true????

Also, how 'bout torque specs for timing cover and waterpump?

Thanks in advance for your responses.
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post #2 of 5 (permalink) Old 08-14-2010
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My Shop Manual says 13 -18 ft/lbs, too. It also says to apply graphite grease to the mating surface, not a gasket.

Joe
'65 Coupe, 302, Autolite 4100, C4, 2.80
'72 Grande, 351C, Motorcraft 2100, FMX, 2.75
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post #3 of 5 (permalink) Old 08-14-2010 Thread Starter
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Thank you Joe.
My aluminum intake manifold bolts state 15 ft/lbs. and they are only 5/16". It seems strange that cast iron exhaust manifolds with 3/8" bolts are 13-18 ft/lbs. I'm pretty sure they are grade 5. I found a torque website that states 36 lbs. for grade 5 3/8" bolts.

Unless I hear otherwise, I'll torque them to 13-18 ft/lbs.

Anyone know the timing cover and waterpump ft/lbs?
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post #4 of 5 (permalink) Old 08-14-2010
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12 - 15 ft/lbs for both. The torque value for the exhaust probably seems low for the bolt size because of the extreme heat they are subject to. Trust me, after you run the engine a bit, they ain't comin' out!

Joe
'65 Coupe, 302, Autolite 4100, C4, 2.80
'72 Grande, 351C, Motorcraft 2100, FMX, 2.75
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post #5 of 5 (permalink) Old 08-14-2010 Thread Starter
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Thanks again Joe. I'll bet if they were torqued tighter they might break with the heat expansion.
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